Google Keyword Rank Is Collapsing Down

Hi my keywords were at first page in 8th position.. Gradually when I started working on those keywords to get it on top 5, its collapsing though I'm posting in dofollow sites.. Kindly suggest me what step I need to take to get my keywords on TOP 5. Any new Techniques that i need to follow?

The fact that you think "posting in dofollow site" is a "useful" activity says that you have totally the wrong idea about SEO.
So;
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